Power-tube distortion is required for amp sounds in some genres. In a standard master-volume guitar amp, as the amp's final or master volume is increased beyond the full power of the amplifier, power tube distortion is produced. The power soak approach places the attenuation between the power tubes and the guitar speaker.
The second most common reason for causing a brake light on your dash is if your brake fluid is low. There is a sensor that is inside the brake master cylinder that can tell when the fluid gets low. This sensor will illuminate the brake warning light to let the driver know that the brake system needs attention asap.
Malfunctions that will cause Service indicator light to come on include: 1  Low engine oil pressure. 2  High hydraulic oil temperature (PowrReverser/Wet Clutch Tractors) 3  High coolant temperature. 4  Rear PTO switch on and operator out of seat. 5  Water in fuel. 6  High manifold air temperature.